Investments in low-carbon sources of electricity, such as renewables, large hydro and nuclear, were much higher than for fossil fuel generation. The record $262bn renewable investment in 2015 was more than twice the $130bn that went into coal and gas.

In fact, this has been the case for several years, highlighting the extent to which low-carbon, generally and renewables, in particular, have become mainstream.

However, it's worth noting that investments in oil and gas exploration and extraction easily eclipse spending on new electricity generation capacity. Despite huge spending cuts in the wake of the oil price crash, oil and gas investment in 2016 is expected to be $522bn, down from $595bn in 2015.

Last year also saw renewables, excluding large hydro, account for more than half of new power generation capacity for the first time. Of the 253 gigawatts (GW) added around the world in 2015, 134GW was from renewables excluding large hydro.

The world's fossil-fired capacity also increased. After accounting for closures, global coal capacity increased by 42GW and gas by 40GW. Nuclear capacity grew by 15GW.

The UNEP report shows, for the first time, that most renewable energy investment was in developing nations. This trend appears to be accelerating as ambition soars in China and India, while stalling across Europe.

This regional split is seen even more clearly on the map, below. China, which now spends more on renewables than the U.S. and Europe combined, has ambitious plans to double its wind capacity and treble its solar capacity during its next five-year plan to 2020.

In contrast, spending in Europe has more than halved since a 2011 peak and has now fallen back to 2006 levels. U.S. investment has been relatively steady. The recent extension of wind and solar tax credits should ensure this continues.